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Old 01-13-2018, 01:54 AM
hari109 hari109 is offline
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Join Date: Jan 2018
Location: India
Posts: 14
Thumbs up An Experimental Professor

An eccentric professor used a unique way to measure time for a test lasting 15 minutes.

He used just two hourglasses. One measured 7 minutes and the other 11 minutes.
During the whole time he turned the hourglasses only few times.

How did he measure the 15 minutes?

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